Hunted by the Ozars and Daunkirks, Grimmis, a Mauler Silverback, leads a small number of Maulers into the Ice Kraggs to escape. There, they survive for years, hoping to one day return to the Green Wall to reclaim their territory and save other Silverback tribes from servitude. In his old age, moments before passing away, Grimmis one more time claims there will come an Alpha-Taur among them who will lead them back to the Green Wall, hoping it would be his son Haxzus, and not even dreaming that the runt of the Ravis pack, Terrabyss, could one day become a formidable competitor.

Years later, two rogue Eclupse Silverbacks, Dio, and his daughter Luna, make their way into the Ice Kraggs to convince the Maulers to join them in retaking the Green Wall. Haxzus is challenged and defeated, making Dio the new Alpha of the Maulers. With Terrabyss and the other Maulers beside him, Dio now leads them to the Green Wall, hoping to reclaim their home. What they don't know is that Forver, a rich Ozar who had failed to capture the group of Eclupse Dio belonged to, is waiting for just the right opportunity to take his revenge and redeem his Yukon bloodline.